The Altonar Calendar
The Altonar Calendar was created at the beginning of the Age of Awakening. It contains 10 months: Yanwhe, Fernsty, Manwhe, Wexling, Petal, Yanos, Inari, Auri, Blugree and Decarion, Yanwhe being the first month of the year.
Each month has 33 days, except for the tenth, which has 35, the last two often being viewed as unattached days, representing the transition to the next year.
The days of the week are:
Mûning - Only on the first day of each month
Kvarsynodium - Every second, 10th, 18th, and 26th day of each month
Brandtag - Every third, 11th, 19th, and 27th day of each month
Bachtag - Every fourth, 12th, 20th, and 28th day of each month
Prickeltag - Every fifth, 13th, 21th, and 29th day of each month
Erdtag - Every sixth, 14th, 22th, and 30th day of each month
Briestag - Every seventh, 15th, 23rd, and 31st day of each month
Keepersdey - Every eight, 16th, 24th, and 32nd day of each month
Odendey - Every ninth, 17th, 25th, and 33rd day of each month
The days are named differently in the Middle Lands, though this is the calendar used there as well.